This phase 2 study was designed to assess the safety and efficacy of masitinib (AB1010) in patients with relapsing/refractory t(4;14) Multiple Myeloma. Response and progression were assessed according to the Bladé revised IMWG criteria1 from lowest point.

Inclusion Criteria:

• Confirmed multiple myeloma with a t (4; 14) translocation by FISH and PCR, expressing or not expressing FGFR3 identified by FACS
• Patients with Multiple Myeloma progressing or relapsing after at least two prior therapies (including conventional chemotherapy and/or high dose therapy) or who get a reduction of M-protein less than 75% within 3 months after a high dose treatment (Melphalan 200mg/m2) or after the plateau obtained for 3 months duration following to a conventional chemotherapy
• Patient with rapidly progressive disease with cytopenia and / or renal failure have to be stabilized with chemotherapy (if possible 3 cycles of VTD ( Bortezomib/Thalidomide/dexamethasone) or high dose Melphalan regimen followed by a 4 weeks washout period before the inclusion in the study.
• Patients must have a clearly detectable and quantifiable monoclonal M- component value (>5 g/l) in the serum and / or urine light chain excretion (>0,5 g/d)

Exclusion Criteria:

• Prior corticosteroids within two weeks before enrolment
• Prior local irradiation within two weeks before enrolment
• Prior experimental or standard treatment (other than steroids and local irradiation) within 30 days before enrolment